<template>
    <div class="container" :class="{'container_night': nightMode}">
        <el-container>
            <el-header class="editor__header">
                <editor-header
                    ref="header"
                    @refresh="onEditorRefresh"
                    @cssChanged="cssChanged"
                    @downLoad="downloadEditorContent"
                    @showCssEditor="showCssEditor = !showCssEditor"
                    @showAboutDialog="aboutDialogVisible = true"
                    @showDialogForm="dialogFormVisible = true"
                    @showDialogUploadImg="dialogUploadImgVisible = true"
                    @startCopy="isCoping = true, backLight = true"
                    @endCopy="endCopy"
                />
            </el-header>
            <el-main class="main-body">
                <el-row class="main-section">
                    <el-col :span="12" @contextmenu.prevent.native="openMenu($event)">
                        <textarea id="editor" type="textarea" placeholder="Your markdown text here." v-model="source">
                        </textarea>
                    </el-col>
                    <el-col :span="12" class="preview-wrapper" id="preview" ref="preview" :class="{'preview-wrapper_night': nightMode && isCoping}">
                        <section id="output-wrapper" :class="{'output_night': nightMode && !backLight}">
                            <div class="preview">
                                <section id="output" v-html="output">
                                </section>
                                <div class="loading-mask" v-if="nightMode && isCoping">
                                    <div class="loading__img"></div>
                                    <span>正在生成</span>
                                </div>
                            </div>
                        </section>
                    </el-col>
                    <transition name="custom-classes-transition" enter-active-class="bounceInRight">
                        <el-col id="cssBox" :span="12" v-show="showCssEditor">
                            <textarea id="cssEditor" type="textarea" placeholder="Your custom css here.">
                                </textarea>
                        </el-col>
                    </transition>
                </el-row>
            </el-main>
        </el-container>
        <upload-img-dialog v-model="dialogUploadImgVisible" @close="dialogUploadImgVisible = false" @uploaded="uploaded" />
        <about-dialog v-model="aboutDialogVisible"/>
        <insert-form-dialog v-model="dialogFormVisible"/>
        <right-click-menu
            v-model="rightClickMenuVisible"
            :left="mouseLeft"
            :top="mouseTop"
            @menuTick="onMenuEvent"
            @closeMenu="closeRightClickMenu"
        />
    </div>
</template>
<script>
import editorHeader from '../components/CodemirrorEditor/header';
import aboutDialog from '../components/CodemirrorEditor/aboutDialog';
import insertFormDialog from '../components/CodemirrorEditor/insertForm';
import rightClickMenu from '../components/CodemirrorEditor/rightClickMenu';
import uploadImgDialog from '../components/CodemirrorEditor/uploadImgDialog';

import {
    css2json,
    downLoadMD,
    setFontSize,
    saveEditorContent,
    customCssWithTemplate
} from '../assets/scripts/util'
import {uploadImgFile} from '../assets/scripts/uploadImageFile';

require('codemirror/mode/javascript/javascript')
import {mapState, mapMutations} from 'vuex';
export default {
    data() {
        return {
            showCssEditor: false,
            aboutDialogVisible: false,
            dialogUploadImgVisible: false,
            dialogFormVisible: false,
            isCoping: false,
            isImgLoading: false,
            backLight: false,
            timeout: null,
            changeTimer: null,
            source: '',
            mouseLeft: 0,
            mouseTop: 0
        }
    },
    components: {
        editorHeader,
        aboutDialog,
        insertFormDialog,
        rightClickMenu,
        uploadImgDialog
    },
    computed: {
        ...mapState({
            wxRenderer: state => state.wxRenderer,
            output: state => state.output,
            editor: state => state.editor,
            cssEditor: state => state.cssEditor,
            currentSize: state => state.currentSize,
            currentColor: state => state.currentColor,
            nightMode: state => state.nightMode,
            rightClickMenuVisible: state => state.rightClickMenuVisible
        })
    },
    created() {
        this.initEditorState()
        this.$nextTick(() => {
            this.initEditor()
            this.initCssEditor()
            this.onEditorRefresh()
        })
    },
    methods: {
        initEditor() {
            this.initEditorEntity();
            this.editor.on('change', (cm, e) => {
                if (this.changeTimer) clearTimeout(this.changeTimer);
                this.changeTimer = setTimeout(() => {
                    this.onEditorRefresh()
                    saveEditorContent(this.editor, '__editor_content')
                }, 300);
            });

            // 粘贴上传图片并插入
            this.editor.on('paste', (cm, e) => {
                if (!(e.clipboardData && e.clipboardData.items) || this.isImgLoading) {
                    return;
                }
                for (let i = 0, len = e.clipboardData.items.length; i < len; ++i) {
                    let item = e.clipboardData.items[i]
                    if (item.kind === 'file') {
                        this.isImgLoading = true;
                        const pasteFile = item.getAsFile()
                        uploadImgFile(pasteFile).then(res => {
                            this.uploaded(res)
                        }).catch(err => {
                            this.$message({
                                showClose: true,
                                message: err,
                                type: 'error'
                            });
                        });
                        this.isImgLoading = false;
                    }
                }
            });

            this.editor.on('mousedown', () => {
                this.$store.commit('setRightClickMenuVisible', false);
            });
            this.editor.on('blur', () => {
                //!影响到右键菜单的点击事件，右键菜单的点击事件在组件内通过mousedown触发
                this.$store.commit('setRightClickMenuVisible', false);   
            });
            this.editor.on('scroll', () => {
                this.$store.commit('setRightClickMenuVisible', false);
            });

        },
        initCssEditor() {
            this.initCssEditorEntity();
            // 自动提示
            this.cssEditor.on('keyup', (cm, e) => {
                if ((e.keyCode >= 65 && e.keyCode <= 90) || e.keyCode === 189) {
                    cm.showHint(e)
                }
            });
            this.cssEditor.on('update', (instance) => {
                this.cssChanged();
                saveEditorContent(this.cssEditor, '__css_content')
            })
        },
        cssChanged() {
            let json = css2json(this.cssEditor.getValue(0));
            let theme = setFontSize(this.currentSize.replace('px', ''));

            theme = customCssWithTemplate(json, this.currentColor, theme)
            this.setWxRendererOptions({
                theme: theme
            });
            this.onEditorRefresh();
        },
        // 图片上传结束
        uploaded(response) {
            if (!response) {
                this.$message({
                    showClose: true,
                    message: '上传图片未知异常',
                    type: 'error'
                });
                return;
            }
            this.dialogUploadImgVisible = false
            // 上传成功，获取光标
            const cursor = this.editor.getCursor();
            const imageUrl = response;
            const markdownImage = `![](${imageUrl})`;
            // 将 Markdown 形式的 URL 插入编辑框光标所在位置
            this.editor.replaceSelection(`\n${markdownImage}\n`, cursor);
            this.$message({
                showClose: true,
                message: '图片插入成功',
                type: 'success'
            });
            this.onEditorRefresh();
        },
        // 左右滚动
        leftAndRightScroll() {
            const scrollCB = text => {
                let source, target;

                clearTimeout(this.timeout);
                if (text === 'preview') {
                    source = this.$refs.preview.$el;
                    target = document.getElementsByClassName('CodeMirror-scroll')[0];
                    this.editor.off('scroll', editorScrollCB);
                    this.timeout = setTimeout(() => {
                        this.editor.on('scroll', editorScrollCB);
                    }, 300);
                } else if (text === 'editor') {
                    source = document.getElementsByClassName('CodeMirror-scroll')[0];
                    target = this.$refs.preview.$el;
                    target.removeEventListener("scroll", previewScrollCB, false);
                    this.timeout = setTimeout(() => {
                        target.addEventListener("scroll", previewScrollCB, false);
                    }, 300);
                }

                let percentage = source.scrollTop / (source.scrollHeight - source.offsetHeight);
                let height = percentage * (target.scrollHeight - target.offsetHeight);

                target.scrollTo(0, height);
            };
            const editorScrollCB = () => {
                scrollCB('editor');
            };
            const previewScrollCB = () => {
                scrollCB('preview');
            };

            this.$refs.preview.$el.addEventListener("scroll", previewScrollCB, false);
            this.editor.on('scroll', editorScrollCB);
        },
        // 更新编辑器
        onEditorRefresh() {
            this.editorRefresh();
            setTimeout(() => PR.prettyPrint(), 0);
        },
        // 复制结束
        endCopy() {
            this.backLight = false;
            setTimeout(() => {
                this.isCoping = false;
            }, 800);
        },
        // 下载编辑器内容到本地
        downloadEditorContent() {
            downLoadMD(this.editor.getValue(0));
        },
        // 右键菜单
        openMenu(e) {
            const menuMinWidth = 105;
            const offsetLeft = this.$el.getBoundingClientRect().left;
            const offsetWidth = this.$el.offsetWidth;
            const maxLeft = offsetWidth - menuMinWidth;
            const left = e.clientX - offsetLeft;
            this.mouseLeft = Math.min(maxLeft, left);
            this.mouseTop = e.clientY + 10;
            this.$store.commit('setRightClickMenuVisible', true);
        },
        closeRightClickMenu(){
            this.$store.commit('setRightClickMenuVisible', false);
        },
        onMenuEvent(type, info = {}) {
            switch (type) {
                case 'pageReset':
                    this.$refs.header.showResetConfirm = true;
                    break;
                case 'insertPic':
                    this.dialogUploadImgVisible = true
                    break;
                case 'downLoad':
                    this.downloadEditorContent();
                    break;
                case 'insertTable':
                    this.dialogFormVisible = true;
                default:
                    break;
            }
        },
        ...mapMutations([
            'initEditorState',
            'initEditorEntity',
            'setWxRendererOptions',
            'editorRefresh',
            'initCssEditorEntity'])
    },
    mounted() {
        setTimeout(() => {
            this.leftAndRightScroll();
            PR.prettyPrint()
        }, 300);
    }
}

</script>
<style lang="less" scoped>
.main-body {
    padding-top: 12px;
    overflow: hidden;
}
.el-main {
    transition: all .3s;
    padding: 0;
    margin: 20px;
    margin-top: 0;
}
.container {
    transition: all .3s;
}
.preview {
    transition: background 0s;
    transition-delay: .2s;
}
.preview-wrapper_night {
    overflow-y: inherit;
    position: relative;
    left: -3px;
    .preview {
        background-color: #fff;
    }
}
#output-wrapper {
    position: relative;
}
.loading-mask {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 376px;
    height: 101%;
    padding-top: 1px;
    font-size: 15px;
    color: gray;
    background-color: #1e1e1e;
    .loading__img {
        position: absolute;
        left: 50%;
        top: 330px;
        width: 50px;
        height: 50px;
        transform: translate(-50%, -50%);
        background: url('../assets/images/favicon.png') no-repeat;
        background-size: cover;
    }
    span {
        position: absolute;
        left: 50%;
        top: 390px;
        transform: translate(-50%, -50%);
    }
}
.bounceInRight {
    animation-name: bounceInRight;
    animation-duration: 1s;
    animation-fill-mode: both;
}
@keyframes bounceInRight {
    0%,60%,75%,90%,100% {
        transition-timing-function: cubic-bezier(0.215,.610,.355,1.000)
    }
    0% {
        opacity:0;
        transform:translate3d(3000px,0,0)}
    60% {
        opacity:1;
        transform:translate3d(-25px,0,0)
    }
    75% {
        transform:translate3d(10px,0,0)
    }
    90% {
        transform:translate3d(-5px,0,0)
    }
    100% {
        transform:none
    }
}
</style>
<style lang="less">
@import url('../assets/less/app.less');
@import url('../assets/less/style-mirror.css');
@import url('../assets/less/github-v2.min.css');
</style>

